LAPP AUTOMAATIO W-K-F Indoor-Outdoor Resistance Temperature Sensor User Manual

: June 9, 2024
: LAPP AUTOMAATIO

LAPP AUTOMAATIO W-K-F Indoor-Outdoor Resistance Temperature Sensor

Product description and intended use

Sensor types W-K-F and W-M-F are indoor/outdoor temperature sensors (resistance, RTD) constructed in plastic (-K-) or metal (-M-) enclosures (connection boxes) of ingress protection rating IP 65.
Sensors are intended for room or other ambient temperature measuring applications, to be installed on wall or various structures.
Standard construction is with Pt100 resistance sensor for measuring range -40 +80 °C. Thermocouple versions can be produced on request. A 2-wire mA- transmitter can be integrated into the enclosure.
Sensors are available with connection terminal block (type designation: “-CB”) or with open wire ends to be connected to temperature transmitter inside the enclosure (type designation: “ TR”). The latter can be delivered with a transmitter.
Ex i option: The metal enclosure versions W-M-F are also available as ATEX and IECEx approved protection type Ex i versions. Please see section Ex i data. Ex d option: Indoor/outdoor sensors as protection type Ex d versions can be executed with other sensor types.
Please contact our sales for further details.
EPIC® SENSORS temperature sensors are measuring devices intended for professional use. They should be mounted by professionally capable installer who understands the installations surroundings. The worker should understand mechanical and electrical needs and safety instructions of the object installation. Suitable safety gear for each installation task must be used.

Temperatures, measuring

Allowed measuring temperature range for sensor tip is:

With Pt100 -40…+80 °C

Other ranges on request.

Temperatures, ambient

Allowed ambient temperature range for enclosure, including connection wires, is:

Without transmitter -40…+80 °C
With transmitter according to transmitter manufacturers data

Make sure the temperature is not too much for the enclosure and/or the transmitter inside.

Temperatures, Ex versions

For Ex versions only, specific temperature conditions apply according to the ATEX and IECEx certificates. For more details, please see sections:

Ex i: please see section Ex i data (only for types with Ex i approval), sensor type designation -EXI-.
Ex d: please contact our sales for further details.

Code key

Product code key

Technical data

Enclosure| Plastic enclosure dimensions 120x80x58 mm(:.¥ x H x 0)1
Metal enclosure dimensions 80x75x58 mm (W x H x D) Other enclosures on request
---|---
T o le r an c es Pt 100 ( IEC 607 5 1)| A tolerance = ± 0.15 ± 0.00 2 x t. operating temperature -100…± 450 °C
B tolerance ± 0.3 + 0.005 x t, operating temperature – 196…+600 °C
B 1/ 3 DIN tolerance ±1/ 3 x (0.3 + 0.005 x t), operating temperature -196…+600 °C
B 1/ 10 DIN tolerance ± 1/10 x (0.3 – 0.005 x t ) operating temperature -196… -‘-600 °C
Temperature range Pt 1 00| -40…+80 °C, other measurement ranges on request
Ap p ro va l s| ATE X, IECEx, EAC Ex, EAC EMC, METROLOGICAL PATTERN APPROVAL
Qu a lity certifi c ate| ISO 9001:2015 and ISO 14001:2015 issued by DNV
IP r atin g| IP65. higher IP rating on request

Materials

These are the standard materials of components for the sensor types W-K-F and W-M-F.

Enclosure, plastic version -K- Polycarbonate (PC-V0)
Enclosure, metal version -M- Aluminum
Enclosure, Ex d version (option)
Aluminum or Stainless Steel (DIN 1.4401, AISI 316)
Sensor element AISI 316L
Cable glands Polyamide

Other materials can be used on request.

Dimensional Drawing

Plastic enclosure:
Metal enclosure:

Installation Instructions and Example

Before any installation, make sure the target process/machinery and site are safe to work! Installation phases:

Drill applicable fastening holes to wall or other structure, according to dimensional drawing on previous page.
Insert fastening plugs to holes if needed.
Install the enclosure by screwing in applicable screw types, depending on the enclosure type.
Connect cable wires to connection terminals or transmitter connection screws.
Install the enclosure cover ensuring the sealing is securely on its place.
Image below: this example shows sensors, with plastic and EXD enclosures, installed on wall.

Tightening torques

Use only tightening torques allowed in applicable standards of each thread size and material.

Opening the enclosure, standard and Ex i versions

Before any connection work, the enclosure cover has to be opened. Do not open the cover if there is a risk of dirt or moisture/liquids entering the wiring space inside!

Image below: Open the enclosure cover by opening four (4) cover screws, on each corner.

Plastic enclosure:
Metal enclosure:

Note! For Ex i versions, only metal enclosure can be used.

Opening the connection head, Ex d versions (option)

Do not open the connection head cover if explosive atmosphere is present!
Do not open the cover if there is a risk of dirt or moisture/liquids entering the wiring space inside!

The Ex d certified sensors head, type designation -EXD-, can be opened by twisting the cover counterclockwise.

Image below:

Opening the EXD sensor head, by twisting cover ccw.
Earth terminal, ground connection screw.

For Ex d versions, please contact our sales.

Pt100; connection wiring

Image below: These are the connection colors of Pt100 resistor connections, according to standard EN 60751.

Other connections on request.

Pt100; measuring current

The highest allowed measuring current for Pt100 measuring resistors depends on resistor type and brand.
Normally the recommended maximum values are:

Pt100 1 mA
Pt500 0,5 mA
Pt1000 0,3 mA.

Do not use higher measuring current. It will lead to false measurement values and might even destroy the resistor.

Above listed values are normal measuring current values. For Ex i certified sensor types, type designation -EXI-, higher values (worst case) are used for the self-heating calculation for safety reasons. For further details and calculation examples, please see ANNEX A.

Type label of standard versions

Each sensor has a type label attached to. It is a moisture and wear proof industrial grade sticker, with black text on white label. This label has printed information of trade name, web page, type code, CE-mark, product number and serial number, including production date. For these sensors manufacturer contact information is printed on a separate label.

Image below: Example of a non-Ex sensor type label.

For EAC EMC-approved, sensor+transmitter combination versions, exported to Eurasian Customs Union area, there is a special type label.

Image below: Example of an EAC EMC-approved product type label, including sensor (1) and transmitter (2).

Serial number information

Serial number S/N is always printed on type label in the following form: yymmdd-xxxxxxx-x:

yymmdd production date, e.g. “210131” = 31.1.2021
– xxxxxxx production order, e.g. “1234567”
-x sequential ID number within this production order, e.g. “1”

Ex i data (only for types with Ex i approval)

This sensor type, with metal enclosure, is available also with ATEX and IECEx Ex i approvals. Assembly consists of a temperature sensor connected to a transmitter or connection terminal block in a metal enclosure (sensor type designation -EXI-). All relevant Ex data is given below.

Ex i – Special Conditions for Use

There are special specifications and conditions for use defined in certificates. These include e.g. Ex data, allowed ambient temperatures, and self-heating calculation with examples. These are presented in Annex A: Specification and special conditions for use – Ex i approved EPIC®SENSORS temperature sensors.

Ex i certificates and Ex markings

Certificate – Number| Issued by| Applicable area| Marking
---|---|---|---
ATEX –
EESF 21 ATEX 043X| Eurofins Electric & Electronics Finland Oy, Finland,
Notified Body Nr 0537| Europe| Ex II 1G Ex ia IIC T6…T3 Ga
Ex II 1/2G Ex ib IIC T6…T3 Ga/Gb
Ex II 1D Ex ia IIIC T135 °C Da
Ex II 1/2D Ex ib IIIC T135 °C Da/Db
IECEx – IECEx EESF 21.0027X| Eurofins Electric & Electronics Finland Oy, Finland,
Notified Body Nr 0537| Global| Ex ia IIC T6…T3 Ga
Ex ib IIC T6…T3 Ga/Gb Ex ia IIIC T135 °C Da
Ex ib IIIC T135 °C Da/Db

Note! Name change of the Notified Body Nr 0537:

Until 31.3.2022, the name was : Eurofins Expert Services Oy
As of 1.4.2022, the name is : Eurofins Electric & Electronics Finland Oy.

Ex i type label

For ATEX and IECEx Ex i approved versions there is more information on the label, according to applicable standards.

Image below: Example of an ATEX and IECEx Ex i approved sensor type label.

EU Declaration of Conformity

The EU Declaration of Conformity, declaring products‘ conformance to the European Directives, is delivered with products or sent on request.

Manufacturer contact information

Manufacturer HQ main office:

Lapp Automaatio Oy
Street address Martinkyläntie 52
Postal address FI-01720 Vantaa, Finland

Production site and logistics:

Lapp Automaatio Oy
Street address Varastokatu 10
Postal address FI-05800 Hyvinkää, Finland

Phone (sales) +358 20 764 64
Emailepicsensors.fi.lav@lapp.com
Https www.epicsensors.com

Document history

Version /
date| Author(s)| Description
---|---|---
20220401| LAPP/JuPi| Original version

Although every reasonable effort is made to ensure the accuracy of the content of the operating instructions, Lapp Automaatio Oy is not responsible for the way the publications are used or for possible misinterpretations by end users. The user must ensure that she or he has the latest edition of this publication.
We reserve the right to make changes without prior notice. © Lapp Automaatio Oy

ANNEX A – Specification and special conditions for use – Ex i approved EPIC® SENSORS temperature sensors

Ex data for RTD (resistance temperature sensor) and TC (Thermocouple temperature sensor)
Sensor Ex data, maximum interface values, without transmitter or / and display.

Table 1. Sensor Ex data.

Electrical values	For Group IIC	For Group IIIC
Voltage Ui	30 V	30 V
Current Ii	100 mA	100 mA
Power Pi	750 mW	550 mW @ Ta +100 °C
	650 mW @ Ta +70 °C
	750 mW @ Ta +40 °C
Capacitance Ci	Negligible, *	Negligible, *
Inductance Li	Negligible, *	Negligible, *

For sensors with long cable part, the parameters Ci and Li must be included in the calculation.
Following values per meter can be used according to EN 60079-14:
Ccable = 200 pF/m and Lcable = 1 μH/m.

Allowed ambient temperatures – Ex i temperature class, without transmitter and/or display.

Marking, Gas Group IIC| Temperature
class| Ambient temperature
---|---|---
II 1G Ex ia IIC T6 Ga
II 1/2G Ex ib IIC T6-T3 Ga/Gb| T6| -40…+80 °C
II 1G Ex ia IIC T5 Ga
II 1/2G Ex ib IIC T6-T3 Ga/Gb| T5| -40…+95 °C
II 1G Ex ia IIC T4-T3 Ga
II 1/2G Ex ib IIC T6-T3 Ga/Gb| T4-T3| -40…+100 °C

Table 2. Ex i temperature classes and allowed ambient temperature ranges

Marking, Dust Group IIIC| Power Pi| Ambient
temperature
---|---|---
II 1D Ex ia IIIC T135 °C Da
II 1/2D Ex ib IIIC T135 °C Da/Db| 750 mW| -40…+40 °C
II 1D Ex ia IIIC T135 °C Da
II 1/2D Ex ib IIIC T135 °C Da/Db| 650 mW| -40…+70 °C
II 1D Ex ia IIIC T135 °C Da
II 1/2D Ex ib IIIC T135 °C Da/Db| 550 mW| -40…+100 °C

Note!
The temperatures above are without gable glands.
The compatibility of cable glands must be according to the application specifications.
If the transmitter and/or display will be inside the transmitter housing, the specific Ex requirements of the transmitter and/or display installation must be noted.
The used materials must comply the needs of application, e.g., abrasion, and the temperatures above.
For EPL Ga Group IIC the aluminum parts in connection heads are subject to sparking by impacts or friction.
For Group IIIC the maximum input power Pi shall be observed.
When the sensors are mounted across boundary between different Zones, refer to standard IEC 60079-26 section 6, for ensuring the boundary wall between different hazardous areas.

ANNEX A – Specification and special conditions for use – Ex i approved EPIC® SENSORS temperature sensors

Considering sensor self-heating
Self-heating of the sensor tip shall be considered in respect with Temperature Classification and associated ambient temperature range and manufacturer’s instructions for calculating tip surface temperature according to thermal resistances stated in the instructions shall be observed.
Allowed ambient temperature range of sensor head or process connection for Groups IIC and IIIC with different temperature classes are listed in Table 2. For Group IIIC the maximum input power Pi shall be observed.
The process temperature shall not adversely affect ambient temperature range assigned for Temperature Classification.

Calculation for self-heating of the sensor at the tip of sensor or the thermowell tip
When the sensor-tip is located at environment where the temperature is within T6…T3, it is needed to consider the self-heating of the sensor. Self-heating is of particular significance when measuring low temperatures.
The self-heating at the sensor tip or thermowell tip depends on the sensor type (RTD/TC), the diameter of sensor and structure of sensor. It is also needed to consider the Ex i values for the transmitter. The table 3.
shows the Rth values for different type of sensors structure.

Table 3. Thermal resistance based on Test report 211126

	Thermal resistance Rth [°C / W]
Sensor type	Resistance thermometer (RTD)
Measuring insert diameter	< 3 mm
Without thermowell	350

With thermowell made from tube material
(e.g. B-6k, B-9K, B-6, B-9, A-15, A-22, F-11, etc)| 185| 140| 55| 50| 13| 5
With thermowell – solid material
(e.g. D-Dx, A-Ø-U)| 65| 50| 20| 20| 5| 1

Note!
If the measuring device for RTD-measuring is using measuring current > 1 mA, the maximum surface temperature of the temperature sensor tip should be calculated and taken to account. Please see next page.
If sensor type has multiple sensing elements included, and those are used simultaneously, note that the maximum power for all sensing elements should not be more than the allowed total power Pi.
Maximum power must be limited to 750 mW. This must be guaranteed by process owner. (Not applicable for Multi-point temperature sensor types T-MP / W-MP or T-MPT / W-MPT with segregated Exi circuits).

ANNEX A – Specification and special conditions for use – Ex i approved EPIC® SENSORS temperature sensors

Calculation for maximum temperature:
The self-heating of the sensor tip can be calculated from formula:

Tmax= Po × Rth + MT

(Tmax) = Maximum temperature = surface temperature at the sensor tip
(Po) = Maximum feeding power for the sensor (see the transmitter certificate)
(Rth) = Thermal resistance (K/W, Table 3.)
(MT) = Medium temperature.

Calculate the maximum possible temperature at the tip of sensor:

**Example 1 - Calculation for RTD-sensor tip with thermowell**

Sensor used at Zone 0
RTD sensor type: W-M-9K . . . (RTD-sensor with head-mounted transmitter).
Sensor with thermowell, diameter of Ø 9 mm.
Medium temperature (MT) is 120 °C
Measuring is made with PR electronics head mounted transmitter 5437D and isolated barrier PR 9106 B.
Maximum temperature (Tmax) can be calculated by adding the temperature of the medium that you are measuring and the self-heating. The self-heating of the sensor tip can be calculated from the Maximum power (Po) which is feeding the sensor and Rth-value of used sensor type. (See the Table 3.)

Supplied power by PR 5437 D is (Po) = 23,3 mW (from the transmitter Ex certificate)
Temperature class T4 (135 °C) must not be exceeded.
Thermal resistance (Rth) for the sensor is = 55 K/W (from Table 3).
Self-heating is 0.0233 W * 55 K/W = 1,28 K
Maximum temperature (Tmax) is MT + self-heating: 120 °C + 1,28 °C = 121,28 °C The result in this example shows that, the self-heating at the senor tip is negligible. The safety margin for (T6 to T3) is 5 °C and that must be subtracted from 135 °C; means that up to 130 °C would be acceptable. In this example the temperature of class T4 is not exceeded.

Example 2 - Calculation for RTD-sensor tip without the thermowell.

Sensor used at Zone 1
RTD sensor type: W-M-6/303 . . . (RTD-sensor with cable, without head-mounted transmitter)
Sensor without thermowell, diameter of Ø 6 mm.
Medium temperature (MT) is 40 °C
Measuring is made with rail-mounted PR electronics PR 9113D isolated transmitter/barrier.
Maximum temperature (Tmax) can be calculated by adding the temperature of the medium that you are measuring and the self-heating. The self-heating of the sensor tip can be calculated from the Maximum power (Po) which is feeding the sensor and Rth-value of used sensor type. (See the Table 3.)

Supplied power by PR 9113D is (Po) = 40,0 mW (from the transmitter Ex- certificate)
Temperature class T3 (200 °C) must not be exceeded.
Thermal resistance (Rth) for the sensor is = 100 K/W (from Table 3).
Self-heating is 0.040 W * 100 K/W = 4,00 K
Maximum temperature (Tmax) is MT + self-heating: 40 °C + 4,00 °C = 44,00 °C
The result in this example shows that, the self-heating at the senor tip is negligible. The safety margin for (T6 to T3) is 5 °C and that must be subtracted from 200 °C; means that up to 195 °C would be acceptable. In this example the temperature of class T3 is not exceeded.

ANNEX A – Specification and special conditions for use – Ex i approved EPIC® SENSORS temperature sensors

Additional information for Group II devices: (acc. to EN IEC 60079-0: 2019 section: 5.3.2.2 and 26.5.1)

Temperature class for T3 = 200 °C
Temperature class for T4 = 135 °C
Safety margin for T3 to T6 = 5 K
Safety margin for T1 to T2 = 10 K.

Note

This ANNEX is an instructional document on specifications.
For original regulatory data on specific conditions for use, always refer to ATEX and IECEx certificates:
EESF 21 ATEX 043X
IECEx EESF 21.0027X

Customer Support

Lapp Automaatio Oy
Martinkyläntie 52
FI-01720 Vantaa, Finland
lappautomaatio.fi

Tekninen myynti/Technical sales:
P: +358 (0)20 764 6410
Avoimet tilaukset/Open orders:
P: +358 (0)20 764 6420

Kotipaikka/Domicile
Vantaa
Y-tunnus: 1107293-1
VAT: FI11072931

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with the LAPP Group